Fundamentals of Python Programming

Python numpy.linspace()

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Python numpy.linspace()

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Introduction

In this article, we shall learn about the method “linspace” from the module “numpy” in Python. It is a Python method that returns evenly-spaced numbers over a given interval. linspace() is quite similar to the Python arange() function. But a difference in between the two is that linspace() uses a sample number instead of a step.

Scope

In this article we shall learn about:

  • Syntax of using the linspace() method in Python.
  • The parameters that the linspace function takes.
  • The return value of the linspace method.
  • A fine example of using the linspace() method along with code implementation.

Syntax

numpy.linspace(start, stop, num, endpoint, retstep, dtype)

Parameters

start

It is an optional parameter and denotes the start of the range of the interval. Its default value is zero.

stop

It represents the end of the interval range.

restep

If set to True, returns (samples, step). The default value is False.

num

It’s an optional parameter the value of which must be a number dictating the number of samples to be generated.

dtype

It’s the type of output array.

Return

ndarray
step: If restep were set to True, [float, optional]

Implementation and examples

Example 1

import numpy as np
print(np.linspace(2.0, 3.0, num=5, retstep=True))
item =np.linspace(0, 2, 10)
print(np.sin(item))

Output

(array([2.  , 2.25, 2.5 , 2.75, 3.  ]), 0.25)
[0.         0.22039774 0.42995636 0.6183698  0.77637192 0.8961922
 0.9719379  0.99988386 0.9786557  0.9092974

Example 2

import numpy as np
import pylab as pl
x = np.linspace(0, 2, 10, endpoint = False)
y = np.ones(10)
pl.plot(x, y, '*')
pl.xlim(-0.2, 1.8)

Output

Image Courtesy: geeksforgeeks

Example 3

import numpy as np
import pylab as pl
x =np.linspace(0, 2, 15, endpoint = True)
y = np.zeros(15)
pl.plot(x, y, 'o')
pl.xlim(-0.2, 2.1)

Output

Image Courtesy: geeksforgeeks
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